Human Nutrition Fundamentals
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Questions and Answers

Which protein function is primarily responsible for maintaining growth?

  • Tissue synthesis (correct)
  • Fluid balance
  • Energy supply
  • Hormonal regulation
  • What type of fatty acid is characterized by having no carbon double bonds?

  • Polyunsaturated fatty acid
  • Saturated fatty acid (correct)
  • Unsaturated fatty acid
  • Trans fatty acid
  • Which of the following fatty acids is classified as omega-3?

  • Stearic acid
  • Linoleic acid
  • Arachidonic acid
  • Alpha-linolenic acid (correct)
  • What is the main role of phospholipids in cell membranes?

    <p>Control passage of compounds (D)</p> Signup and view all the answers

    Which type of lipids are found predominantly in animal sources and are solid at room temperature?

    <p>Saturated fats (D)</p> Signup and view all the answers

    What is the primary function of cholesterol in the body?

    <p>Cell membrane structure (A)</p> Signup and view all the answers

    Which of the following conditions can arise from a deficiency in linoleic acid?

    <p>Skin eczema (C)</p> Signup and view all the answers

    Which type of fatty acid typically has a higher melting point?

    <p>Trans fatty acids (B)</p> Signup and view all the answers

    In which food sources can you find alpha-linolenic acid?

    <p>Vegetable oils (C)</p> Signup and view all the answers

    What is the consequence of hydrogenation of fats?

    <p>Production of saturated fats (C)</p> Signup and view all the answers

    Which type of fatty acid is primarily found in coconut oil?

    <p>Medium-chain triglyceride (C)</p> Signup and view all the answers

    Which of the following is a source of omega-6 fatty acids?

    <p>Sunflower oil (B)</p> Signup and view all the answers

    What is the primary function of essential fatty acids in the diet?

    <p>Support growth and maintenance of body tissues (B)</p> Signup and view all the answers

    Which type of vitamin requires fat for its absorption?

    <p>Vitamin D (A)</p> Signup and view all the answers

    In a calorie-restricted diet, which vitamin supplementation is most appropriate?

    <p>Vitamin B12 (C)</p> Signup and view all the answers

    Which vitamin acts as a coenzyme in carbohydrate metabolism?

    <p>Thiamine (B1) (D)</p> Signup and view all the answers

    What is the primary role of electrolytes in the body?

    <p>To regulate fluid balance and nerve function (C)</p> Signup and view all the answers

    Which mineral is considered a trace element in the diet?

    <p>Iron (A)</p> Signup and view all the answers

    What is the primary dietary source of vitamin E?

    <p>Nuts and seeds (C)</p> Signup and view all the answers

    How does the body primarily excrete water-soluble vitamins?

    <p>Via urine (B)</p> Signup and view all the answers

    Which source of energy does the brain primarily utilize?

    <p>Glucose (A)</p> Signup and view all the answers

    What is the temporary increase in glycogen stores known as?

    <p>Glycogen supercompensation (B)</p> Signup and view all the answers

    What type of amino acids must be obtained through diet due to insufficient synthesis by the body?

    <p>Essential amino acids (B)</p> Signup and view all the answers

    Which of the following hormones primarily regulates metabolism and the oxidation rate?

    <p>Thyroxine (T4) (A)</p> Signup and view all the answers

    What type of fiber can absorb water and is broken down by intestinal microflora?

    <p>Soluble fiber (B)</p> Signup and view all the answers

    What is the main food source for carbohydrates derived from plants?

    <p>Starch (B)</p> Signup and view all the answers

    Which of the following carbohydrates is resistant to digestion?

    <p>Fiber (A)</p> Signup and view all the answers

    What macronutrient is primarily responsible for the protein-sparing action in the body?

    <p>Carbohydrates (B)</p> Signup and view all the answers

    Which vitamin is critical for enzyme activation, particularly in energy production?

    <p>Niacin (C)</p> Signup and view all the answers

    During which condition might certain amino acids become condtionally essential?

    <p>During physical stress (B)</p> Signup and view all the answers

    What does the basal metabolic rate (BMR) mainly reflect?

    <p>The minimum energy required to maintain vital functions at rest (B)</p> Signup and view all the answers

    Which protein classification includes only essential amino acids in sufficient ratios?

    <p>Complete proteins (A)</p> Signup and view all the answers

    Indirect calorimetry is useful for assessing energy metabolism in which individuals?

    <p>Athletes and burn patients (A)</p> Signup and view all the answers

    Which macronutrient has the highest caloric value per gram?

    <p>Fats (C)</p> Signup and view all the answers

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    Flashcards

    Triglyceride

    A type of lipid that is made up of three fatty acids attached to a glycerol molecule.

    Fatty Acid

    A straight chain of carbon atoms with a carboxyl group (COOH) at one end and a methyl group (CH3) at the other end.

    Saturated Fatty Acid

    A fatty acid that has no double bonds between its carbon atoms.

    Unsaturated Fatty Acid

    A fatty acid that has one or more double bonds between its carbon atoms.

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    Monounsaturated Fatty Acid (MUFA)

    An unsaturated fatty acid with one double bond.

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    Polyunsaturated Fatty Acid (PUFA)

    An unsaturated fatty acid with two or more double bonds.

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    Omega-3 Fatty Acid

    A type of polyunsaturated fatty acid with a double bond between the 3rd and 4th carbon atom from the methyl end.

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    Omega-6 Fatty Acid

    A type of polyunsaturated fatty acid with a double bond between the 6th and 7th carbon atom from the methyl end.

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    Hydrogenation

    A process where hydrogen atoms are added to double bonds in unsaturated fatty acids, making them more saturated and stable.

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    Trans Fatty Acid

    A type of unsaturated fatty acid with hydrogen atoms on opposite sides of the double bond.

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    Saturated Fatty Acids (SFAs)

    A type of fat that contains only single bonds between carbon atoms. They are typically solid at room temperature and found in sources like coconut oil, butter, and palm oil.

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    Essential Fatty Acids

    Essential fatty acids are those your body cannot produce on its own and must be obtained through your diet. Omega-3 and omega-6 are essential fatty acids.

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    Eicosanoids

    Regulatory molecules derived from omega fatty acids. They play a role in inflammation, blood clotting, and immune function.

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    Vitamins

    Organic compounds that are essential for various bodily functions, required in small amounts. Vitamins are categorized as either fat-soluble or water-soluble.

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    Fat-Soluble Vitamins

    Vitamins that dissolve in fat and are stored in the body. Examples include vitamins A, D, E, and K.

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    Water-Soluble Vitamins

    Vitamins that dissolve in water and are not stored in the body. Examples include B vitamins and vitamin C.

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    Glucose

    The primary energy source for the brain. It is also used by other cells in the body.

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    Ketone Bodies

    A type of fuel that the brain uses during prolonged starvation. It is produced from the breakdown of fats.

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    Glycogen

    The storage form of carbohydrates in the body. It is found in the liver and muscles.

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    Fat

    The storage form of fat in the body. It is found in adipose tissue.

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    Gluconeogenesis

    The conversion of non-carbohydrate sources (glycerol and amino acids) into glucose. It is used to maintain blood glucose levels during fasting or when carbohydrate intake is low.

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    Homeostasis

    A state of equilibrium of the internal environment of the body. This includes maintaining constant body temperature, pH, and blood sugar levels.

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    Enzymes

    Organic catalysts that speed up chemical reactions within the body. They are mostly made up of proteins.

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    Coenzymes

    Substances that activate enzymes. They include vitamins, minerals, and other organic molecules.

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    Substrate

    The substance that an enzyme acts upon.

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    Cofactors

    Substances that assist enzymes in their function. They are often minerals.

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    Hormones

    Chemical messengers that trigger enzymes.

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    Thyroxine

    A hormone produced by the thyroid gland. It regulates metabolism and the rate of oxidation in the body.

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    Anabolism

    The synthesis of larger molecules from smaller ones. This process requires energy.

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    Catabolism

    The breakdown of complex molecules into simpler ones. This releases energy.

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    Basal Energy Expenditure (BEE)

    The minimum amount of energy needed by the body at rest.

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    Study Notes

    Human Nutrition Fundamentals

    • Energy & Nutrients: Energy is derived from macronutrients (carbohydrates, fats, proteins), micronutrients, alcohol, fluids, and electrolytes. Acid-base balance is also important.

    • Human Nutrition: The process encompasses intake, digestion, absorption, metabolism, and elimination.

    • Energy: The brain uses glucose for energy; ketone bodies are used during starvation to provide energy.

    • Storage: Glucose is stored as glycogen in muscles and the liver, while fat is stored in adipose tissue.

    • Protein: Cellular mass is composed of proteins. Non-carbohydrate sources like glycerol and amino acids can be converted into glucose. Homeostasis maintains a consistent internal body environment.

    • Cellular Processes: Enzymes (proteins) catalyze reactions controlled by coenzymes (some vitamins) and cofactors (minerals). Pantothenic acid, thiamine, riboflavin, and niacin are crucial for energy production.

    • Hormones: Chemical messengers secreted by endocrine glands, such as thyroxine, influence metabolism and growth.

    • Energy Reactions: Anabolism builds complex molecules, and catabolism breaks down molecules, releasing energy; this creates energy needed from food.

    • Energy Expenditure: Basal energy expenditure (BEE) is the minimum energy required at rest; total energy expenditure (TEE) includes energy required for basic functions and activity.

    • Factors affecting metabolic rate: Extreme temperatures (7-15% increase), caffeine, alcohol, nicotine all influence the metabolic rate.

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    Description

    Explore the essential topics of human nutrition, including energy sources from macronutrients and how they affect digestion, absorption, and metabolism. Learn about the storage of glucose and fats, the role of proteins in cellular mass, and the importance of enzymes and hormones in the body's energy production and homeostasis.

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